/Engine/Source/Runtime/Engine/Classes/Engine/CancellableAsyncAction.h
Base class for asynchronous actions that can be spawned fromUK2Node_AsyncActionor C++ code. These actions register themselves with the game instance and need to be explicitly canceled or ended normally to go away. The ExposedAsyncProxy metadata specifies the blueprint node will return this object for later canceling.
class UCancellableAsyncAction : public [UBlueprintAsyncActionBase](API\Runtime\Engine\Kismet\UBlueprintAsyncActionBase)